“In 2016, cyber actors affiliated with the Russian Government conducted an unprecedented, coordinated cyber campaign against state election infrastructure. Russian actors scanned databases for vulnerabilities, attempted intrusions, and in a small number of cases successfully penetrated a voter registration database. This activity was part of a larger campaign to prepare to undermine confidence in the voting process.”

And this is not simply a thing that happened once. This is a thing that is still happening and will continue to happen. As Director of National Intelligence Dan Coats told the committee in February, “Persistent and disruptive cyberoperations will continue against the United States and our European allies using elections as opportunities to undermine democracy.” As he put it, “Frankly, the United States is under attack.”

The Robert Mueller investigation is looking into this, trying to figure out what exactly happened in 2016, who all was involved, which laws were broken and who will be charged and tried.

“Special counsel Robert Mueller’s team has either indicted or gotten guilty pleas from 32 people and three companies — that we know of. That group is composed of four former Trump advisers, 26 Russian nationals, three Russian companies, one California man, and one London-based lawyer. Five of these people (including three former Trump aides) have already pleaded guilty.”

“From phishing attacks to gain access to Democratic operatives, to money laundering, to attempts to break into state elections boards, the indictment details a vigorous and complex effort by Russia’s top military intelligence service to sabotage the campaign of Mr. Trump’s Democratic rival, Hillary Clinton.”

Whether or not Trump himself or anyone in his orbit personally colluded or conspired with the Russians about their interference is something Mueller will no doubt disclose at some point, but there remains one incontrovertible truth: In 2016, Russia, a hostile foreign adversary, attacked the United States of America.

We know that they did it. We have proof. The F.B.I. is trying to hold people accountable for it.

And yet Trump, the president whom the Constitution establishes as the commander in chief, has repeatedly waffled on whether Russia conducted the attack and has refused to forcefully rebuke them for it, let alone punish them for it.

In March, the White House, under pressure from Congress, seemed to somewhat reluctantly impose some sanctions on Russia for its crimes. As CNN reported that month, Congress almost unanimously passed the Countering America’s Adversaries Through Sanctions Act last summer, “hoping to pressure Trump into punishing Russia for its election interference.” But as the network pointed out:

“Trump signed the bill reluctantly in August, claiming it impinged upon his executive powers and could dampen his attempts to improve ties with Moscow.”

Instead, Trump has repeatedly attacked the investigation as a witch hunt.

“I think I would have a very good relationship with Putin if we spend time together. After watching the rigged witch-hunt yesterday, I think it really hurts our country and our relationship with Russia. I hope we can have a good relationship with Russia.”

Now Trump is set to pursue just such a relationship as he meets one-on-one with the Russian president, Vladimir Putin, on Monday in Finland. As Trump said earlier this month at a rally:

“Will he be prepared? Will he be prepared? And I might even end up having a good relationship, but they’re going, ‘Will President Trump be prepared? You know, President Putin is K.G.B. and this and that.’ You know what? Putin’s fine. He’s fine. We’re all fine. We’re people.”

Actually, none of this is fine. None of it! Trump should be directing all resources at his disposal to punish Russia for the attacks and prevent future ones. But he is not.

America’s commander wants to be chummy with the enemy who committed the crime. Trump is more concerned with protecting his presidency and validating his election than he is in protecting this country.

This is an incredible, unprecedented moment.America is being betrayed by its own president. America is under attack and its president absolutely refuses to defend it.

Charles M. Blow has been an Op-Ed columnist since 2008. His column appears every Monday and Thursday. He joined The Times in 1994 and was previously the graphics director. He also wrote the book “Fire Shut Up in My Bones.” @CharlesMBlow•Facebook